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Java源码：URL编程

作者:jdeveloper [文章出自: www.fanqiang.com]

Example 1 Below is a simple Java program which can get the hostname of a computer
from IP address. download now

Tips
1. Compile: javac GetHost
2. Run: java GetHost 111.111.111.1(your IP or others)
import java.io.*;
import java.net.*;
//
//
// GetHost.java
//
//
public class GetHost
{
public static void main (String arg[]){
if (arg.length>=1){
InetAddress[] Inet;
int i=1;
try{
for (i=1;i<=arg.length;i++){
Inet = InetAddress.getAllByName(arg[i-1]);
for (int j=1;j<=Inet.length;j++){
System.out.print(Inet[j-1].toString());
System.out.print("\n");
}
}
}
catch(UnknownHostException e){
System.out.print("Unknown HostName!"+arg[i-1]);
}
}
else{
System.out.print("Usage java/jview GetIp ");
}
}
}

Example 2
download now
//GetHTML.java
/**
* This is a program which can read information from a web server.
* @version 1.0 2000/01/01
* @author jdeveloper
**/
import java.net.*;
import java.io.*;

public class GetHTML {
public static void main(String args[]){
if (args.length < 1){
System.out.println("USAGE: java GetHTML httpaddress");
System.exit(1);
}
String sURLAddress = new String(args[0]);
URL    url = null;
try{
   url = new URL(sURLAddress);
}catch(MalformedURLException e){
   System.err.println(e.toString());
                   System.exit(1);
}
try{
                   InputStream ins = url.openStream();
   BufferedReader breader = new BufferedReader(new InputStreamReader(ins));
                   String info = breader.readLine();
                   while(info != null){
                        System.out.println(info);
                        info  = breader.readLine();
   }
}
                catch(IOException e){
   System.err.println(e.toString());
                   System.exit(1);
}
}
}

文章加入时间: 2004-11-17 14:58:43 责任编辑: w9   (2548 人次查阅)